Argon is a member of noble gas and it has eight electrons in its valency. It is completing its valence by the octet rule.

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What is argon?

Argon is a chemical element with has an atomic number 18. It is represented by the symbol Ar and its standard atomic weight is 39.95. It is a P-block element and a gas at STP. It's a colourless, odourless, non-toxic and non-flammable gas. It is an inert gas but can form compounds under extreme conditions like Argon fluorohydride. The electronic configuration of Agron is [Ne] 3s2 3p6. Its melting point is 83.81 K ?(−189.34 °C, ?−308.81 °F) and its boiling point is 87.302 K ?(−185.848 °C, ?−302.526 °F). In the periodic table, it is in the 3rd period and group18 (Noble gas).

There 26 isotopes of Argon in which 3 are naturally occurring and stable the rest are radioisotopes. A-36, Ar-38 and Ar-40 are naturally stable isotopes and has abundance 0.334%, 0.063% and 99.604% respectively. Argon is the most abundant noble gas in Earth's crust. Argon was discovered and first isolated by Lord Rayleigh and William Ramsay in 1894. 


How many neutrons does argon have?

Argon has 22 neutrons. There are three stable isotopes of Argon each has a different number of neutrons. Argon-36 isotope has 18 neutrons, Argon-38 isotope has 20 and Argon-40 isotope has 22 neutrons,